DE2164026A1 - Bending device and method for producing bends - Google Patents

Description

DIPL.-ING. KLAUS BEHN DIPL.-PHYS. ROBERT MÜNZHUBER

PATENT LAWYERS

8 MUNICH 22 Wl DENMAYERSTRASSE 6 TEL. (0811) 22 25 30 -29 51 92

December 22nd, I97I Us. Characters: A 4o4 7I / A 411 7I - Pi / La

Mr. RONALD EDWARD BENTON, 61, St. Alban's Road, Cheam, Surrey, England.

Bending device and method for making

Bends.

It is an object of the invention to provide a bending device that has two bending members, Drive means coupled to them to effect the bending and means for guiding or plaguing of the workpiece in a first working position for two bends on it, caused by the movement of the flexible links be evoked. Furthermore, there should be a relative movement between the bent workpiece and the bending members take place in a second working position of the workpiece, and the workpiece should be in this second working position

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Bankhaus Merck F.nck & Co .. Munich. No. 25 464 I Bankhaus H. Aufhäuser. Munich. No. 261 3OQ postal check. Munich 209

Telegram address: patent senior

position for two more bends can be set, which in turn are carried out by the movement of the two identical flexures.

Another object of the invention is a bending method using a bending device which has two movable flexure members for performing bending when the workpiece is in a first one Position is set, in which then a relative movement between the workpiece and the bending members in a second Position of the workpiece relative to the flexures takes place, and the workpiece with two bends by corresponding Movements of the same flexures is provided.

The invention is preferably, but not exclusively, applicable to the manufacture of square or rectangular frames, which can be made of pipe or rod material made of various metals, preferably made of soft steel. However, the device is described for the manufacture of rectangular frames Wire about 1 mm in diameter and 1 cm in diameter.

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To make understandable, an embodiment of the invention is described with the drawing.

Pig. 1 is a plan view of a left one

Rotary bending head of an embodiment of the invention comprising a workpiece auS "shows wire before bending. Also, one is dashed in this plan view The illustrated view of the wire after the first bending operation;

Figure 2 is a top plan view of a right bending head (corresponding to the head of Fig. 1) of the same embodiment, the wire in a position for a second bending operation shows, in dashed view, the wire after bending;

Figure 3 is a cross section of the left bending head.

A bending device according to the invention has a left and a right bending head which is designed as a mirror image of the left one. Each bending head has a central shaft 18 which is rotatable in a cup-shaped guide part 12 which is attached to a bed 10, .11. A drive plate 26, 27 is mounted and fastened on the shaft (shaft) 18. In the center of the drive plate 26, 27 there is a form bolt IJ, 14 around which a wire workpiece I7 is bent. On an elevated quarter of the drive plate 26, 27 there is a bending molded part (bending bolt) 23, 24, so that when the drive plate 26 or 27 rotates, the bending molded part (bending

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bolt) 23, 24 moved, with the wire I7 around the central molding 13, 14 is bent. It's a fixing or holding block I5, 16 is present, which fixes the wire and can be moved in a sliding guide 21, 22. The fixing block 15, 16 has an S-shaped member 30 which has an adjustable holding or clamping block 3I wearing. There is an adjustable stop I9 or 20, which limits the path of the sliding support block I5, 16. The sliding support block I5, 16 is by a Actuated piston 32, which is through the cup-shaped approach 12 extends and is displaced by a pneumatic cylinder 28, 29. The power can also go through a other appropriate means are exercised, e.g. B. by a hydraulic medium or by hand. With a suitable shape (Upward extension) of block I5, 16 and the parts 13, 14 and 23, 24 can use multiple wires at the same time Bending can be arranged.

In the bending process, one or more wires are inserted into the pair of retaining blocks I5 and 16 shown in the same position is set in the sliding guides 21, 22 and are held or blocked in this, (see the position shown in Fig. 1) to simultaneously with the two Working together.

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The device is started and a 90 ° bend is made on the left and right Bending head, so that a "ü" is formed. In this first bending operation, the wires grip blocks 51 at. Both drive plates (bending plates) 26, 27 rotate back to their original position and then move both sliding support blocks 15 * 16 from the central one Bending bolts Ij5, 14 away in the slideways 21, 22, to which hit adjustable stops I9, 20, where they are held or blocked, and wherein they bring the wire or wires into a second layer (see Fig. 2). The bending heads are actuated again so that the drive plates 26, 27 and the bending bolts 23, 24 rotated by 180 and thereby form a complete rectangle. During this second bending operation, the Wires against auxiliary links 25, which are essentially of L-shaped cross-section. The holding blocks I5, 16 are then returned to their original position. Around a 90 bend make the heads turn a little past 90, e.g. B. between 92 ° and 100 °, depending on the type of the workpiece. For the second bending operation, rotate a little more than 180 °.

To adjust the bending device for right

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to enable corners of different lengths (the width can be adjusted using the stops I9, 20), the bending heads are mounted on cross rails (not shown) by means of beds lO and 11, of which one bed is fixed on the rails and the other to and from this along the Rails is movable and can be fixed in a desired position.

The sequence of operations can be controlled manually or by any known means. if If a pneumatic power drive is used, it is useful to control the work sequence automatically to be carried out by means of a pneumatic control circuit in which each work step (after the first) is automatic is initiated by limit switches, which indicate that the previous work step has been completed. Any suitable means can be provided in order to produce two different angles of rotation of the drive heads. At the Using a known pneumatic circuit, this can be accomplished by arranging two separate limit switches at opposite ends of a rocking arm, so that one of the switches before the first bending operation is in the path of an actuator that is of a

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pneumatically driven rack, which drives a pinion seated on the shaft (or the shaft) 18 in order to cause the latter to rotate. This switch causes a reversal of a pneumatic valve, which controls the force of the rack after bending by 90 ^0th The limit switch causes the rocking arm to rotate after the bending head has returned to its original position after the first bending operation, and brings the second limit switch into the path of the actuator to cause a reversal of the rack in the subsequent second bending operation bending through 180 °. After the second bending operation has been carried out, the switching arm can be rotated back into its first position when the bending head has been rotated back into its starting position. Safety devices can ensure that the work steps of the two bending heads are completed at each step before the next work step is initiated.

In the embodiment shown, blocks j50 are shown which move in a guideway. Around To avoid undesired mutual metal abrasion, one of the metals can be phosphor bronze and the other

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Be steel. In a modification, the blocks can be mounted on linear bearings, e.g. B. on a ball bearing, which is supported on a shaft. Furthermore, a lead screw with a small pitch and a high Speed can be used. It is also possible to use a guide of the types mentioned above that is common to both heads and with one single block 30 is provided with both heads cooperates or is provided with a pull rod that pulls on both blocks ^ O.

The two heads can be operated independently, but simultaneously, or they can be operated by a common power circuit, or it can be a mechanical or pneumatic or hydraulic Link between them.

If the plates 26, 27 are driven by a force medium, there will be movements which do not cause bending and therefore do not require driving by the force medium. For example, the drive plates are rotated back to their initial positions and then rotated in the same direction as before to 90 ⁰ between the first and second bending operation,

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before the bending formers 2j5, 2k are brought into contact with the bent workpiece for the second bending operation. There is then a 180 ° turn back to the starting position after the second bending operation. One or more of these movements, which take place with little or no effort, can be transmitted to the blocks JO by connecting plates 26, 27, e.g. B. by a rack and pinion or by a ratchet or by a Leergangseinricntung (lost motion device). A ratchet device can also be used to simplify the drive for the second bending operation if the plates 26, 27 are not rotated back into their starting position between the first and second bending operations, but instead remain in their 90 position.

If the two heads can be adjustably spaced from one another, e.g. B. one or Both can be adjustably attached to a (not shown) cross rail, must also have some mechanical Connection between the blocks can be set. The problem of adjustability is simplified if a (pneumatic or hydraulic) force medium link is present, through the use of flexible force

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medium feeds.

In order to set up the device for bending workpieces of different thicknesses, the bending formers 23, 24 on the drive plates 26, 27 can be adjusted in their radial position. The distance of the bending formers 23, 24 from the center formers 13, ¹ ^ must be limited enough to achieve sufficient bending sharpness, but must not be so small that notches or cracks are caused in the workpiece.

Instead of having two different degrees of rotation in the same direction for each of the two drive plates 26, 27, it is possible to have a further fitting 23, 24 to be arranged by 90 ° in front of the fittings 23, 24, which is normally withdrawn into the panels 26, 12 and only snapped and used for the second bending operation.

It is also possible to use a rectilinear rather than a rotating movement of the shaped pieces 23, 24. For certain workpiece shapes it would be useful to use curved guides for the blocks.

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The erected (upwardly directed) part of the block 30, which in Fig. 1 aie with the center former (Center bolt) is the same height, could be used as an inner bending former by being for this Purpose is curved and extends upward in Fig. 1 to also be used as the flexure for the second bending operation to serve. The extension can be of adjustable length. Furthermore, the block 30 be monolithic in order to fix the workpiece on two sides at the same time and for bending and transporting (relocating) to serve the same. A fixed block or edge of the slide 21 could be on the right side of block 30 can be used, as can be seen in Fig. 1, to receive the pressure when block 30 is used as a center Bending former is used.

It can be seen that the workpiece can be held stationary and then the bending heads can be held at the same time can be moved. It would be possible to do the second bend differently. A useful modification the device could allow this second bending operation to be done outwardly. The first bending operation can be made using complementary bend angles that are obtuse on one head and on the other head are pointed to avoid a right-angled

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to produce a long parallelogram. In this case you can the sliding guides be angular, or the retaining blocks can be offset or staggered, with their jaws running in a common direction. It can also be useful in certain cases for the two bending heads to be used one after the other and not at the same time work.

In a bending process as described above, the setting up or setting of the bending device can be done very quickly, since only two adjustments are required, namely the adjustment of the distance between the Heads for the length of a rectangular frame and positioning stops I9, 20 for the width of the frame. Adjustable stops can be placed to the left of the left head and to the right of the right head, see above that an unbent workpiece can easily be stored precisely in the two bending heads. When determining the required Length of the workpiece, an approximate calculation is made for the required length under insertion the length and width of the rectangle, with or without taking into account the radius of curvature and / or the thickness of the workpiece, and a workpiece whose predetermined (calculated) length is too short is

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provided device bent. Then the gap between the workpiece ends is measured and a corresponding one Correction of the calculated workpiece length made in order to achieve an exact workpiece length.

Since only two bending operations are performed with one movement of the workpiece between them, the whole process of inserting, bending and removing the workpiece can be carried out very quickly in a time of about 1 second. Therefore, the device is very suitable for use with a automatic procedure.

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Claims (1)

-H- PATENT PRINCIPLE 1. j bending device, characterized in that; 3 it has two bending members (2 ^ and 24), furthermore an W drive members (lci, 26, 27) connected or coupled to them, and means for guiding or fixing a workpiece (1?) In a first working position for two bends by the movement of the bending members to a relative movement between them to cause the bent workpiece and the bending members in a second working position relative to the bending members and to fix the workpiece in the second working position for two bends, which in turn are caused by the movement of the same two bending members k members are executed. 2. Apparatus according to claim 1, characterized in that the flexible members are arranged such that they perform a drench movement. j5. Device according to claim 1, characterized in that drive means are arranged for driving the two - 15 209829/0655 the flexures to drive one in one direction and the other in the opposite direction Direction that both flexures move into the first working position and the second working position. 4. Apparatus according to claim 1, characterized in that dai; each of the two flexible links (23, 26 resp. 24, 27) coupled to the drive means (15, 28, 32) in this way is, dai; it is driven in the same direction as for that to make the second bend Make the first bend, and the two bending members make their bending movements in opposite directions perform so that “four bends are made, which run in the same bending direction from one end of the workpiece to the other. -j. Device according to claim 1, characterized in that; Means are present which have bending members and drive means, by means of which the workpiece is bent by 90 ° in each of the four bends, so that the workpiece is bent into a rectangle. 6. Apparatus according to claim 1, characterized in that - 16 209829 / 065S BATH ORIGINAL draws that stops (1-9.20) for each of the limbs are available to define at least two predetermined stop positions for their movement in one Direction when they are driven to perform the bending. 7. Apparatus according to claim 1, characterized in that adjusting means for adjusting the mutual Distance between the flexible links (10, 23, 26 and 11, 24, 27) are arranged. 8. The device according to claim 1, characterized in that the means (30, 31) for plaguing the workpiece and means for effecting movement between the bent workpiece and the flexures to adjust the extent of the movement concerned. 9. The device according to claim 1, characterized in that it is arranged for an elongated Workpiece, and that the means for plaguing the workpiece and arranged to effect relative movement between the bent workpiece and the flexures are that they are transverse to this movement - 17 - 209829/0658 run the original longitudinal axis of the workpiece so that the first two bends between the second both bends lie when going from one end of the workpiece to the other end of the same. 10. The device according to claim 1, characterized in that that the drive means are coupled to the bending means so that they do the same at the same time drive for simultaneous bending in the first and the second bending position. 11. The device according to claim 1, characterized by the following features: the device has two bending heads, each of which has a support part which is rotatable about an axis; each support part (26, 2J) carries one of the two bending members (23, 24) which are arranged at a distance from the axis of rotation; the drive means (28,32) are coupled to the flexures for rotating one flexure in one and the other in the counterclockwise direction simultaneously to make the bends on the workpiece when the workpiece is between each flexure and the corresponding form member; the means for plaguing the workpiece and for effecting a rela- - 18 209829/0655 tive movement between the bent workpiece and the flexures have at least one holding means for holding the workpiece at a point between the both heads and can be moved in a straight guide in order to carry out the corresponding relative movement. 12. A method of bending, characterized in that a bending device is used in it, the has two members which are moved to make bends when the workpiece is in a first position is fixed and made with two bends by moving the corresponding links, at which then a relative movement between the workpiece and the flexures in a second position of the workpiece is carried out relative to the flexures, and the workpiece again with two bends by corresponding Movements of the same flexures is provided. 209829/0655